DPU request: Silk

[jindrichmynarz]

Develop a DPU that wraps Silk link discovery framework. The DPU should work as a transformer that takes data to link as RDF inputs and produces links as RDF output. It should avoid the issues of e-silkLinker DPU from UnifiedViews; i.e. it should directly use the Silk's API instead calling it in an external process using its JAR-file.

The motivation for developing the DPU is that linking may require data pre-processing (e.g., materialization of preliminary data) or post-processing (e.g., deleting superfluous links), both of which can benefit from automation provided by LinkedPipes.